Dense ion clouds of 0.1 − 2 keV ions inside the CPS-region observed by Astrid-2

Høymork, S. H.; Yamauchi, M.; Ebihara, Yusuke; Narita, Yasuhito; Norberg, O.; Winningham, D.

doi:10.5194/angeo-19-621-2001

Cited by 5 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The last problem is the relation to substorms [e.g., Høymork et al, 2001]. Although the simulation by Ebihara et al [2001] predicts wedge-like dispersion during long quiet periods after the substorm injection, not all substorms produce clear wedge-like structures afterward.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Structures of Sub-Kev Ions Inside the Ring Current Region

Yamauchi

Lundin

Eliasson

et al. 2013

The Inner Magnetosphere: Physics and Modeling

Self Cite

View full text Add to dashboard Cite

Structured dispersive sub-keV ions inside the ring current region, or so-called wedge-like dispersions, those which have been considered signatures of long-time drift by ExB and grad-|B| drifts from nightside, are surveyed using the Viking, Freja, Munin, and Cluster satellites. While the ordinary wedge-like dispersion (increasing energy with increasing latitude) is observed mainly in the morning sector at all altitudes (by all spacecrafts), the reversed wedge-like dispersion (decreasing energy with increasing latitude) is observed at different local times by different spacecrafts. The differences between spacecrafts are also found in the H+/O+ ratio and in observation frequency. The observed altitudinal difference indicates that the evolution of drifting particles depends strongly on the mass and mirror altitude.

show abstract

Section: Discussionmentioning

confidence: 99%

“…4. Can all dispersion of sub-keV ions in the ring current region be explained by drifting particles originating from the nightside [cf., Høymork et al, 2001]? Is the island-type really a low-energy (long elapse time) variation of bridgetype dispersion?…”

Section: Wedge-like Dispersionsmentioning

confidence: 99%

Structures of Sub-Kev Ions Inside the Ring Current Region

Yamauchi

Lundin

Eliasson

et al. 2013

The Inner Magnetosphere: Physics and Modeling

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is supported by observations of upward keV electron beams, very intense electric fields (> 1 V/m) and ion heating. Possible source regions of ion clouds observed by the Astrid-2 particle detector are discussed by Høymork et al (2001). Full-orbit data of the plasma density in the top-side ionosphere indicate the presence of large-, medium-, and small-scale plasma density cavities on auroral field lines, of which the latter are likely to be a manifestation of the low-altitude part of the acceleration region.…”

Section: First Astrid-2 Resultsmentioning

confidence: 99%

Astrid-2, an advanced microsatellite for auroral research

2001

View full text Add to dashboard Cite

Abstract. The successful launch of the Swedish microsatellite Astrid-2 in December 1998 began a new era of auroral research, with advanced microprobes of 30 kg or less used as research tools. Innovative technologies and low-mass solutions were used for the sensors and deployment systems to allow a fairly complete set of scientific instruments within the 10 kg allocated for the scientific payload. A newly developed wire boom deployment system proved to function excellently. During its seven month lifetime Astrid-2 collected more than 26 Gbytes of high-quality data of auroral electric and magnetic fields, and auroral particle and plasma characteristics from approximately 3000 orbits at an inclination of 83 • and an altitude of about 1000 km. Scientific results cover a broad range of topics, from the physics of energization of auroral particles to how the magnetosphere responds to the energy input from the solar wind and global magnetic field modelling. The fulfilment of both the technological and the scientific mission objectives has opened entirely new possibilities to carry out low-budget multipoint measurements in near-Earth space.

show abstract

“…Høymork et al (2001) studied dense ion clouds in the inner magnetosphere and discussed their possible relation to substorm ion injection. Further study of the particle characteristics and the plasma flows associated with these events will shed light on the ion injection mechanisms.…”

Section: Scientific Objectives and Resultsmentioning

confidence: 99%

EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

et al. 2004

View full text Add to dashboard Cite

Abstract. The Astrid-2 mission has dual primary objectives. First, it is an orbiting instrument platform for studying auroral electrodynamics. Second, it is a technology demonstration of the feasibility of using micro-satellites for innovative space plasma physics research. The EMMA instrument, which we discuss in the present paper, is designed to provide simultaneous sampling of two electric and three magnetic field components up to about 1 kHz. The spin plane components of the electric field are measured by two pairs of opposing probes extended by wire booms with a separation distance of 6.7 m. The probes have titanium nitride (TiN) surfaces, which has proved to be a material with excellent properties for providing good electrical contact between probe and plasma. The wire booms are of a new design in which the booms in the stowed position are wound around the exterior of the spacecraft body. The boom system was flown for the first time on this mission and worked flawlessly. The magnetic field is measured by a tri-axial fluxgate sensor located at the tip of a rigid, hinged boom extended along the spacecraft spin axis and facing away from the Sun. The new advanced-design fluxgate magnetometer uses digital signal processors for detection and feedback, thereby reducing the analogue circuitry to a minimum. The instrument characteristics as well as a brief review of the science accomplished and planned are presented.

show abstract

Dense ion clouds of 0.1 − 2 keV ions inside the CPS-region observed by Astrid-2

Cited by 5 publications

References 32 publications

Structures of Sub-Kev Ions Inside the Ring Current Region

Structures of Sub-Kev Ions Inside the Ring Current Region

Astrid-2, an advanced microsatellite for auroral research

EMMA - the Electric and Magnetic Monitor of the Aurora on Astrid-2

Contact Info

Product

Resources

About